Blazej Magnowski | 68d0c9b | 2015-09-18 17:25:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License |
| 15 | */ |
| 16 | |
| 17 | package com.android.systemui.classifier; |
| 18 | |
| 19 | /** |
| 20 | * A classifier that looks at the speed of the stroke. It calculates the speed of a stroke in |
| 21 | * inches per second. |
| 22 | */ |
| 23 | public class SpeedClassifier extends StrokeClassifier { |
| 24 | private final float NANOS_TO_SECONDS = 1e9f; |
| 25 | |
| 26 | public SpeedClassifier(ClassifierData classifierData) { |
| 27 | } |
| 28 | |
| 29 | @Override |
Adrian Roos | 401caae | 2016-03-04 13:35:21 -0800 | [diff] [blame] | 30 | public String getTag() { |
| 31 | return "SPD"; |
| 32 | } |
| 33 | |
| 34 | @Override |
Blazej Magnowski | 68d0c9b | 2015-09-18 17:25:55 -0700 | [diff] [blame] | 35 | public float getFalseTouchEvaluation(int type, Stroke stroke) { |
| 36 | float duration = (float) stroke.getDurationNanos() / NANOS_TO_SECONDS; |
| 37 | if (duration == 0.0f) { |
| 38 | return SpeedEvaluator.evaluate(0.0f); |
| 39 | } |
| 40 | return SpeedEvaluator.evaluate(stroke.getTotalLength() / duration); |
| 41 | } |
| 42 | } |